cc: Block the main thread for texture layers during impl-side painting

cc/layer.cc

Index: cc/layer.cc
diff --git a/cc/layer.cc b/cc/layer.cc
index 28cff9864bd9642365b933fc5b8ae7c6ed2a6ce5..7a8138006b36ddd247f9ddc2cce7b50d71c033fe 100644
--- a/cc/layer.cc
+++ b/cc/layer.cc
@@ -130,6 +130,22 @@ bool Layer::blocksPendingCommit() const
     return false;
 }
 
+bool Layer::blocksPendingCommitRecursive() const
+{
+    if (blocksPendingCommit())
+        return true;
+    if (maskLayer() && maskLayer()->blocksPendingCommitRecursive())
+        return true;
+    if (replicaLayer() && replicaLayer()->blocksPendingCommitRecursive())
+        return true;
+    for (size_t i = 0; i < m_children.size(); ++i)
+    {
+        if (m_children[i]->blocksPendingCommitRecursive())
+            return true;
+    }
+    return false;
+}
+
 void Layer::setParent(Layer* layer)
 {
     DCHECK(!layer || !layer->hasAncestor(this));